Formal compounds, fuel oil additives, and fuel oil compositions
CA 2020726 C · Owner: Ishizaki, Takaharu · Inventors: Izaiku, Hiroumi; Kubo, Yoshifumi; Yasukohchi, Tohru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A formal compound is represented by formula (1): wherein R1 is a hydrogen atom or a hydrocarbon group having 1 to 26 carbon atoms, A1 is an alkylene group having 2 to 18 carbon atoms, a is 1 to 100 A2 is an, alkylene group having 2 to 4 carbon atoms b is 1 to 5, R2 is an alkylene group having 2 to 8 carbon atoms c is, 0 to 5, R3 is an alkylene group having 2 to 8 carbon atoms, d is 0 to 5, A3 is an alkylene group having 2 to 4 carbon atoms, e is 0 to 5, and R4 is a hydrogen atom or CH2(OA4)f OR5, in which A4 is an alkylene group having 2 to 18 carbon atoms, f is 1 to 100, and R5 is hydrogen atom or a hydrocarbon group having 1 to 26 carbon atoms and wherein each of (A1O)a, (OA2)b, (NR2)c …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed July 6, 1990 and granted January 5, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 6, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 6, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.